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We present the experimental results of the nanometer Zn films electrical explosion in the air. The film destruction is accompanied with the stratification; the strata are formed in the transverse direction to the applied electric field. The initial strata growth can be explained by the electro-thermal instability development. The strata propagation velocity reaches 50 km/s and depends on the current. The pattern is formed during ~60 ns and each stratum's voltage settles at the constant level limited by arc discharges. We found that strata fractal dimension D=1.55±0.02 for all experiments, which means that the patterns are determined by a certain universal mechanism.